30ft x 10ft = 300 square feet
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30 inches = 2.5 feet So area = 1/2*10*2.5 = 12.5 square feet
The area of a 10 x 30 ft building is 300 square feet
area = width x height = 30 square feet ( not feet) 5 x height = 30 height = 6 feet perimeter = 2 width + 2 height = 10 + 12 = 22 feet
10 yards=30 feet
0.5*(3.6 + 2.4)*10 = 0.5*6*10 = 30 square feet.